We have 4 cheats and tips on PlayStation 2. If you have any cheats or tips for Speed Kings please send them in here. We also have cheats for this game on : GameCube : Xbox
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While the countdown to the race begins (3-2-1) , hold square and press X as soon as the race begins release square and you will be able to do a boost start , I hope it helps.
Happy Gaming!!!
P.S. - Super Cheats rocks
In time attack mode, beat the best record.
Boost start -
Hold Gas and Skid from where it shows the racers to when it says 1 in the count-down to do a boost-start. Your bike will thrust forwards when you let go of X but continue holding A.
Grand Prix mode -
To unlock GPM for single & mult you have to go to time attack and beat the best record.
All tracks -
To gain access to All tracks obtain gold medal on everything in License mode.
The best way to accelerate off the starting point is to hold down gas and brake together then release the brake after the countdown. Your vehicle will be ready to sprint away quickly